Territory



(No Model.)

D. W. ROY.

REVERSING VALVE FOR ENGINES.

Patented Aug. 17, 1897.

INVENTOI? A TTOHNEYS.

WITNESSES m: W n15 PETERS c0, wuo'rcnl'ma, WASHINGTON, n. c.

UNITED STATES 1 ATENT Fries.

DAVID W. ROY, OF TUCSON, ARIZONA TERRITORY.

REVERSlNG-VALVE FOR ENGINE.

SPECIFICATION formingpart of Letters Patent No. 588,533, dated August.17, 1837.

Application filed April 16, 1897.

To all whom it may concern.-

' Be it known that I,'DAVID W. ROY, of Tuc-. son, in the county of Pimaand Territory of Arizona, have invented a new and ImprovedReversing-Valve for En gines,of which the following is a full, clear,and exact description.

The object of the invention is, to provide a new and improvedreversing-valve for engines, which is simple and durable inconstruction, not liable to get out of order, and at all times under theeasy control of the engineer.

The invention consists of certain parts and details and combinations ofthe same, as will be fully described hereinafter and then pointed out inthe claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 isasectional side elevation of the improvement on the line 1 1of Fig. 3. Fig.

2 is asimilar view of the same on the line 2 2 of Fig. 3. Fig. 3 is atransverse section of they improvement on the line 3 3 of Fig. 1, and

Fig. 4c is a sectional side elevation of the im-- provement with thereversing-valve in a neutral or cut-off position. I

The engine on which the improvement is applied is provided with acylinder A, in which reciprocates the piston B, connected in the usualmanner with the main drivingshaft of the engine. Into the ends of thecylinder A open the cylinder-ports a and b, of which the port a.connects at its outer end with the two ports 0 and cl, arranged in thereversing-valve chest 0, containing the reversing-valve D in the form ofa plug-valve, as illustrated in the drawings. The other cylinder-port bconnects at- .its outer end with the two ports 6 and f, likewisearranged in the chest. 0, and leading to the bore 0, in which the valveD is mounted to turn. The ports cand e are arranged opposite each otheron opposite sides of the valve D, and the ports d and f are similarlyarranged relative to each other, but in a different vertical planerelative to the ports 0 and e. The ports a and e are adapted to connectwith a port g, formed on the face of the plug-valve D, and this port 9is adapted to connect with the port j, leading to the steam-chest F,containing the slider Serial No. 632,500. (No model.)

' valve G, operated from the main drivingshaft of the engine in theusual manner. The ports 61 and f are adapted to register with the portsh and/i, arranged opposite each other on the face of the plug-valve D,and the said ports h and z' are adapted to register with the port it,leading to the steam-chest F and controlled similarly to the port jbythe slidevalve G. V e I Between the ports j and 75 is arranged anexhaust-port Z, leading to the outside and adapted to be connected bythe slide-valve G alternately with the ports and it. On the outer end ofthe plug-valve, D is secured a handle E, under the control of theope'rator, for turning the said plug-valve for, re.- versing the engineor for cutting off the steam from the cylinders, as hereinafter morefully described, the swinging movement of the said lever being limitedby stop pins E, projecting from the chest O.

The operation is as follows: YVhen the severalparts are in the positionas illustrated in Figs. 1, 2, and 3, the live steam from the steam-chestF can pass alternately through the portsj, g, o, and a and the ports 70,if, andb into'the right and left hand ends of the cylinder'A to move thepiston forward and backwardtherein in the usual manner, it beingunderstood that the slide-valve G controls the inlet of the steam to thesaid ports j k and the exhaust from the cylinders to the exhaust-port Zthe same as in ordinary engines. When it is desired to reverse theengine, the operator swings the lever E over to the right, so as to movethe plug-valve D into the position indicated in dotted lines in Figs. 1and 2, whereby the steam from the steamchest F can pass through theuncovered port j, the ports g, e, and E) into the right-hand end of thecylinders to move the piston B to the left, and when the. port 70 isuncovered steam passes from the steam-chest through the said port It,the ports h, d, and a, into the left-hand end of the cylinder to movethe piston B to the right. The exhaust takes place through the connectedports and the slidevalve G to the port Z, leading to the outside. Whenit is desired to cut off the steam from the engine, the operator movesthe arm E into a vertical position, so that the plug-valve D closes theupper ends of the ports 0, d, e, and

f to prevent steam passing from the cylinder.

(See Fig. 4.)

Now it will be seen that by the arrangement described thereversing-valve chest is interposed between the ordinary cylinder A andthe ordinary steam-chest F, and said reversing-valve chest contains thereversingvalve D and several port-s, as above described.

Thus the device may be readily applied to any ordinary engine byinterposing the reversing-valve chest between the cylinder and thesteam-chest F.

For new engines the reversing-valve chest 0 may be made integral withthe cylinder A or the steam-chest F.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. A reversing-gear for engines, comprising aslide-valve operating over two inlet-ports and an exhaust-port, and aplug-valve having three ports one of said ports being formed on the faceof said valve and adapted to connect one of the said inlet-ports witheither of the cylinder-ports, the other two ports being arrangedopposite each other on the face of the valve and adapted to connect theother inletport with either of the cylinder-ports, substantially asdescribed.

2. A reversing-gear for engines, comprising a reversing-valve chestprovided with a set of ports arranged opposite each other and connectedwith the respective cylinder-ports, the said valve-chest being providedwith a second set of ports also connected with the cylinder-ports andarranged opposite each other but in a different Vertical plane relativeto the first set of ports, the valve-chest being further provided withtwo inlet-ports connected with the steam-chest, a plug-valve adapted tobe turned in the said valve-chest and formed with a port on its faceadapted to connect one of said inlet-ports with either of the first setof ports in the reversing-valve chest, the said plug-valve being alsoformed with two ports arranged opposite each other on the face of thevalve and adapted to connect the other inlet-port with either of thesecond set of ports in the valve-chest, whereby the steam can pass fromeither of said inlet-ports to either end of the cylinder, substantiallyas shown and described.

3. A reversing-gear for engines, comprising a reversing-valve chestprovided with a set of ports arranged opposite each other and connectedwith the respective cylinder-ports, the said valve-chest being providedwith a second set of ports, also connected with the cylinder-ports andarranged opposite each other but in a different vertical plane relativeto the first set of ports, the reversing-valve chest being furtherprovided with two inlet-ports connected with the steam-chest, aplug-valve adapted to be turned in the said valve-chest and formed witha port on its face adapted to connect one of said inlet-ports witheither of the first set of ports in the reversing-valve chest, the saidplug-valve being also formed with two ports arranged opposite each otheron the face of the valve and adapted to connect the other inlet-portwith either of the second set of ports in the reversing-valve chest,whereby the steam can pass from either of said inlet-ports to either endof the cylinder, and a slide-valveover the said inlet-ports and over theexhaust-port to allow the steam to pass from the cylinder to theoutside, substantially as shown and described.

4. A reversing-gear for engines, comprising a reversing-valve chestprovided with tn 0 sets of ports connected with the cylinder-ports andtwo inletports connected with the steamchest, a plug-valve mounted to beturned in the said valve-chest and having three ports, one of said portsbeing formed on the face of said valve and adapt ed to connect one ofthe said inlet-ports with either of the cylinderports and the other twovalves being arranged opposite each other on the face of the valve andadapted to connect the other inlet-portwith either of thecylinder-ports, means for turning the said plug, and means for limitingthe turning movement of the plug, substantially as shown and described.

DAVID W. ROY. Witnesses:

RAY JOHN. WELCOME, JOHN G. Rov.

